K. M i y a k e , Contribut. to the Fertiliz. and Embryogeny of Abies balsamea. 143 



Papers cited. 



Arnoldi, W., '00: Beiträge zur Morphologie der Gymnospermen, III. 

 Embryogenie von Cephalotaxus Fortunei. Flora, Bd. 87 : 4G— 63, Taf. 1 — 3, 

 190J. 



Blackman, V. H., '98: On the Cytological Features of Fertilization and Re- 

 lated Phenomena in Pinus sylvestris, L. Phil. Trans, ßov. Soc. B, 

 Vol. 190 : 395-426. PL 12— 14,* 1898. 



Cavara, F., 'OC: Osservazioni morfologiche sulle Gimnosperme (notizie 

 preliminari). I. Oogenesi nell' Ahies pectinata. Biül. Soc. Bot. Ital. 



PP. 317—322, 1900. 



Chamberlaiu, J. C. '99: Oogenesis in Pinus Laricio. Bot. Gaz. Vol. 

 27 : 268-280, PL 4—6, 1899. 



Coker, W. C. '02: Notes on the Gametophytes and Embryo oi Podocarpus. 

 Bot. Gaz. Vol. 33 : 89-107, PL 5—7, 1902. 



Ferguson, Margarete, 'Ol: The Development of the Egg and Fertilization 

 in Pinus Strobus. Ann. Bot. Vol. 15 : 435-479, PL 23—25, 1901. 



Ikeno, S. , '98: Untersuchungen über die Entwickelung der Geschlechts- 

 organe und den Vorgang der Befruchtung bei Cycas revoluta. Jahrb. f. 

 wiss. Bot. Bd. 32 : 557—602, Taf. 8—10, 1898. 



Murrill, W. A. , '00: The Development of the Archegonium and Fertili- 

 zation in the Hemlock Spruce (Tsuga canadensis). Ann. Bot. Vol. 14 : 583 — 

 607. PL 31—32, 1900. 



Strasburger, E., '69: Die Befruchtung bei den Coniferen. Jena, 1869. 



Wuicizki, Z., '99: Über die Befruchtung bei den Coniferen. Warschau 

 (Russisch) 1899. (Referred to by Arnoldi). 



Explanatiou of plates. 



All figures were drawn with the aid of a camera lucida. Abreviations 

 used are: e. n., egg-nucleus; n. c, neck-cells; p. t., pollen-tube; sjj.', first 

 sperm-nucleus; sp^, second sperm - nucleus ; sp. c. , sperm-cytoplasm; st. c, 

 stalk-ceU; t. n., tube-nuclcus ; v. c, ventral canal-cell; v. n., nucleus of the 

 ventral canal-cell. 



Plate VI. 



Fig. 1. An archegonium before the division of the central cell. X 90. 



Fig. 2. An archegonium in which the division of the central cell is 

 nearly completed. X 90- 



Fig. 3. An archegonium after the formation of the ventral canal- 

 cell. X 90. 



Fig. 4. The same later stage. X 90. 



Fig. 5. Mature egg. X 90. 



Fig. 6. Upper portion of an archegonium, shortly before the division 

 of the central cell, X 260. 



Fig. 7. A later stage, the nucleus of the central cell preparing to 

 divide. X 260. 



Figs. 8 — 13. Various stages of the division of the central cell. X 2'JÖ. 



Figs. 14 — 17. Later history of the ventral canal-cell and early stages 

 in the development of the egg-nucleus. X 260. 



Fig. 18. Mature egg-nucleus. X 260. 



Plate VII. 



Figs. 19 — 25. Various forms of the egg-nucleus, X 160- 



Fig. Y6. Two consecutive sections of a nucleus of sheath-cell, showing 

 the twelve chromosomes. X 920. 



Fig. 27. An archegonium showing an extra nucleus (x.) at the top of 

 the egg. X 90. 



Figs. 28-30. Aonormal archegonia. Figs. 28—29^ X 90. Fig. 30. 

 Diagramitic outline constructed from serial sections. X öO. 



Beihefte Bot. Centralblat. Bd. XIV. I!i0;3. 10 



